This paper presents measured results of manmade noise impact on an cryogenic receiver front-end (CRFE) in urban and suburban areas in the 2-GHz band with amplitude probability distribution (APD). The CRFE comprises a high-temperature superconducting filter, cryogenically-cooled low-noise amplifier, and highly-reliable cryostat. The CRFE is expected to be an effective and practical approach to attain efficient frequency utilization and to improve the sensitivity of mobile base station receivers.

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... It is important to measure the characteristics of man-made noise in typical cellular base station antenna environments and confirm their impact on the CRFE reception with APD because if man-made noise has a stronger effect than thermal noise, the CRFE would fail to offer any improvement in sensitivity. The measured results suggest that the contribution of man-made noise in the 2-GHz band can be ignored as far as Wideband Code Division Multiple Access (W-CDMA) system is concerned. The manmade noise is also measured in the VHF-band for comparison with the 2-GHz band environment.